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34 results on '"Sasongko, Firman"'

1. A Survey of Impedance Measurement Methods in Power Electronics

Author

Jie, Huamin, Zhao, Zhenyu, Fei, Fan, Simanjorang, Rejeki, Sasongko, Firman, and See, Kye Yak

Subjects
Physics - Instrumentation and Detectors, Electrical Engineering and Systems Science - Systems and Control
Abstract

Impedance is one of the vital parameters that provides useful information for many power electronics related applications. A lot of impedance measurement methods in power electronics have been reported. However, a comprehensive investigation among these methods in terms of their characteristics, advantages, and limitations has not been found in the literature. In order to bridge this gap, a survey of the impedance measurement methods is conducted in this paper. These methods are introduced, discussed, and then classified into different categories depending on the measurement modes, principles, and instruments. Moreover, recommendations for the future research on the impedance measurement are also presented., Comment: The paper has been accepted to be presented at the 2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), and will be published in the IEEE Xplore later

Published
2022

2. High-Precision Broadband Impedance Measurements of Three-Phase Common-Mode Chokes Using Single-Port Circuit De-Embedding and Three-Port Network Calibration Methods

Author

Jie, Huamin, Zhao, Zhenyu, Fan, Fei, Zeng, Yu, Sasongko, Firman, Gupta, Amit Kumar, and See, Kye Yak

Abstract

Common-mode chokes (CMCs) are essential components of electromagnetic interference (EMI) filters. Obtaining precise common-mode (CM) and differential-mode (DM) impedance information of CMCs facilitates their performance evaluation and behavioral modeling, ultimately contributing to optimal EMI filter design. Among existing impedance extraction approaches, measurement methods are the most straightforward, not requiring CMC's detailed geometry and material properties. These methods typically use an impedance analyzer (IA) or vector network analyzer (VNA) with specific fixture adapters for measurements. However, these adapters introduce parasitics, which can affect measurement accuracy, particularly at high frequencies. Some solutions have been proposed but limited to single-phase CMCs. This article presents two impedance measurement methods for three-phase CMCs: single-port circuit de-embedding (SCD) and three-port network calibration (TNC). Both methods consider the parasitics of fixture adapters and provide unique solutions for accurate broadband measurements for the CM and DM impedances of three-phase CMCs. The SCD method has good versatility as it can be implemented using either an IA or VNA; however, it requires fixture adapter details for the de-embedding process. Conversely, the TNC method does not need these details but can only be implemented using an IA. Both methods are validated experimentally with good accuracy from 150 kHz to 120 MHz.

Published
2024
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11. Hybrid Modulation Strategy for the Vienna Rectifier.

Author

Molligoda, Devinda, Ceballos, Salvador, Pou, Josep, Satpathi, Kuntal, Sasongko, Firman, Gajanayake, Chandana, and Gupta, Amit

Subjects
VOLTAGE references, REACTIVE power, HARMONIC suppression filters, VOLTAGE control, PHASE modulation
Abstract

The Vienna rectifier can produce three voltage levels, however only the connection to the neutral-point is fully controllable using the bidirectional switches. When the neutral-point voltage is not imposed in a phase-leg, the polarity of the pulses generated depends on the diode that is conducting in that phase-leg, which is defined by the current direction. As a result, the voltage pulses generated can go in the opposite direction to what is demanded by the controller, and the current becomes distorted. This can be mitigated by injecting a particular zero sequence so that the reference voltage is clamped to the neutral-point during the intervals, where the current of a phase-leg has the opposite sign than its reference voltage. However, the converter is at risk of entering into overmodulation when operating with high modulation indices. In this article, a hybrid modulation strategy is introduced where a calculated minimal amount of reactive current depending on the operating conditions is injected to avoid overmodulation. The reduction of reactive current required compared to the state-of-the-art solutions is up to 100% in certain operating conditions. With the proposed method, the Vienna rectifier can operate in a wide range of power factors without compromising the quality of the source currents. The concept is verified by simulation and in a 1-kW Vienna rectifier experimental setup. [ABSTRACT FROM AUTHOR]

Published
2022
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12. Theory and Experiment on an Optimal Carrier Frequency of a Modular Multilevel Cascade Converter With Phase-Shifted PWM

Author

SASONGKO, FIRMAN, Sasongko, Firman, Sekiguchi, Kei, Oguma, Kouta, Hagiwara, Makoto, and Akagi, Hirofumi

Subjects
Engineering, business.industry, 020209 energy, 020208 electrical & electronic engineering, 02 engineering and technology, Converters, Modular design, Harmonic analysis, Cascade converter, Cascade, Modulation, Control theory, 0202 electrical engineering, electronic engineering, information engineering, Transient (oscillation), Electrical and Electronic Engineering, business, Pulse-width modulation
Abstract

This paper provides theoretical and experimental discussions on an optimal carrier frequency for a phase-shifted pulsewidth modulation modular multilevel cascade converter for grid connections. The theoretical discussion concludes that a ratio of the optimal carrier frequency with respect to the supply (ac) frequency is 5/2. A three-phase downscaled front-to-front system is designed, constructed, and tested to confirm validity of the theoretical discussion. It consists of a pair of three-phase modular multilevel cascade converters rated at 400 Vdc and 10 kW, where the carrier frequency is set to 450 Hz and the ac frequency to 180 Hz, that is, their ratio is equal to 5/2. Moreover, simulated waveforms are compared to experimental ones under the same operating conditions. Both experimental and simulated waveforms agree well with each other not only in steady states but also in transient states.

Published
2016

34. Performance Evaluation and Control Technique of Large Ratio DC-DC Converter.

Author

Purwadi, Agus, Nugroho, Kus Adi, Sasongko, Firman, Sutrisna, Kadek Fendy, and Dahono, Pekik Argo

Subjects
DIRECT current power transmission, ELECTRICAL engineering, CASCADE converters, DIELECTRIC devices, THERMAL conductivity, ELECTRIC power systems, ELECTROMECHANICAL devices
Abstract

The article presents a study which evaluates the performance of large radio direct current (DC)-DC converter by determining its control technique, ripple and losses. The researchers compare the performances of Large Ratio Dc-Dc Converter and multiphase and multilevel dc-dc converters. The study concluded that the high ratio dc-dc converter topology is able to convert its input voltage into very small/big output voltage without need to operate its switching devices.

Published
2009

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